Hello, I have few questions about my new backup configuration. Before asking my questions I will give you some useful information about what I need to do. I need a backup ± 10 servers with one full b
Author: Thomas Mueller <thomas AT chaschperli DOT ch>
Date: Tue, 4 May 2010 11:51:09 +0000 (UTC)
Am Tue, 04 May 2010 08:34:15 +0200 schrieb Vlamsdoem: 100Mb == 100mbit? 100Mbit will result in about 9MB/s . To transfer 3,5TB over ethernet you would need about 108hours. you need _at least_ 1Gbit e
IMHO it's unsafe to back up to a single disk (of any type). Using a RAID set gives much greater resilience for the failures that inevitably happen as time goes by. -- ________________________________
Sorry my servers are on gigabit links. How do you come to 9MB/s with a 100Mb link, is it not equals to 12,5 MB/s? If it's correct on a gigabit link I would have a rate transfer of 90MB/s and the tran
Author: John Drescher <drescherjm AT gmail DOT com>
Date: Wed, 5 May 2010 08:38:08 -0400
Overhead. You will probably get less than that if you do not use jumbo frames. No way are your SATA drives that fast. More likely 1/4 to 1/3 of that speed unless all servers are using high end SSDs.
Author: John Drescher <drescherjm AT gmail DOT com>
Date: Wed, 5 May 2010 08:43:32 -0400
I forgot to mention that this ~100MB/s is only for large sequential reads. When reads get small or random the transfer rate can get less than 10 MB/s per drive. John -- _____________________________
Author: Phil Stracchino <alaric AT metrocast DOT net>
Date: Wed, 05 May 2010 09:12:18 -0400
That. Always remember that the data transfer rates specified on disk interfaces are the maximum burst transfer rate FROM a full disk cache or TO an empty one. The actual sustained rates at which the
... > and the transfer rate of the sata disks are 3Gb/s(375MB/s). ... > >No way are your SATA drives that fast. More likely 1/4 to 1/3 of that If the link is 90 MB/s and drives deliver 1/4 of 375 MB
Author: John Drescher <drescherjm AT gmail DOT com>
Date: Wed, 5 May 2010 12:30:41 -0400
Agreed. That was assuming the unrealistic scenario where all reads (no writes) were large sequential reads on the outer tracks of the hard drive. John -- ____________________________________________
I did an throughput test with iperf between 2 servers on a gigabit link and it results in a 940Mb/s transfer rate . You tell me that transfer rate will be less than 90MB/s, is there so much overhead
Author: Phil Stracchino <alaric AT metrocast DOT net>
Date: Thu, 06 May 2010 09:03:44 -0400
It really varies. I routinely get 95Mbit real-world throughput across my 100Mbit network; I know other people using different hardware or different configurations who've never seen 90Mbit. Gigabit is
Ok with all this information I think I'll try with the sata hard disks. They seems fast enough to achieve everthing in time. Thanks to everbody who helped me on this thread. -- ______________________